Syntheses of 5-hydroxymethylfurfural and levoglucosan by selective dehydration of glucose using solid acid and base catalysts
作者:Mika Ohara、Atsushi Takagaki、Shun Nishimura、Kohki Ebitani
DOI:10.1016/j.apcata.2010.05.040
日期:2010.7
anhydroglucose production with high selectivity. In the presence of solid base, aldose–ketose isomerization of glucose to fructose preferentially occurred by base catalysis, even in coexistence with the solid acid, resulting in successive dehydration of fructose to 5-hydroxymethylfurfural by acid catalysis with high yield in a one-pot reaction. A combination of Amberlyst-15 and hydrotalcite, an anionic layered
分别使用固体酸催化剂或固体酸和碱催化剂的组合分别检测了葡萄糖(最丰富的单糖)的选择性脱水,以分别形成脱水葡萄糖(左旋葡聚糖)或5-羟甲基糠醛(HMF)。在极性非质子传递溶剂(包括N,N中)中,通过酸催化将葡萄糖脱水为脱水葡萄糖-二甲基甲酰胺。Amberlyst-15是一种强酸性离子交换树脂,可作为高效的固体酸催化剂,用于高选择性生产脱水葡萄糖。在固体碱存在下,葡萄糖的醛糖-酮糖异构化优先通过碱催化发生,即使与固体酸共存,也可通过酸催化将果糖连续脱水成5-羟甲基糠醛,一锅得高反应。Amberlyst-15和水滑石(一种阴离子层状粘土)的组合,由于防止了脱水葡萄糖的形成,在中等反应温度下具有很高的HMF选择性。